LLM COST OPTIMIZATION
LLM Cost Optimization
LLM Cost Optimization is useful when it answers a concrete operating question. For LLM workloads, start with prompt/context growth, output length, tool-call fan-out, retries and model routing. CostNerve is designed to keep provider evidence, attribution confidence and economic impact visible instead of reducing the problem to one chart.
What problem does it solve?
- context tokens
- tool calls
- retry rate
- model routing
What to check first
- Establish current spend, previous-period spend and forecast using the same scope.
- Use Spend velocity versus the previous hour/day/week as the first provider-specific check, then attribute spend by project or service. Leave uncertain cost unallocated instead of guessing.
- Rank the top cost drivers by absolute money and growth rate, then investigate the first few deeply.
- Attach every saving or budget action to an owner, expected impact and a verification date.
Metrics and signals that matter
- Spend velocity versus the previous hour/day/week
- Cost by provider, project, service and environment
- Deployment, traffic, retry and job timestamps around the first inflection
- Exact, estimated and unallocated cost separated instead of blended
Likely causes
Optimize the expensive unit first
Do not start with percentage savings. Find the workload that contributes the most absolute spend and reduce its unit cost or unnecessary volume.
Traffic, retries or loops
Legitimate growth, bots, retry storms and recursive/background loops can all multiply a normally cheap unit of work.
Billing dimension changed
For your cloud/AI stack, investigate Spend velocity versus the previous hour/day/week and Cost by provider, project, service and environment before assuming the total moved for a single reason.
How it works
What to measure first
Measure prompt/context growth, output length, tool-call fan-out, retries and model routing. Compare the same scope across periods so volume, unit price and attribution changes are not mixed together.
Turn the signal into a decision
Rank optimizations by monthly saving and product risk: cache, trim context, reduce duplicated calls or route only suitable workloads to cheaper models.
Worked example with explicit assumptions
Illustrative comparison: 100 USD for 10,000 successful requests is 0.01 USD/request. After a change, 72 USD for 9,000 is 0.008 USD/request: unit cost fell 20%, although total spend fell 28%. Check quality before calling the change a saving.
Frequently asked questions
Which your cloud/AI stack signals should I inspect first?
Start with Spend velocity versus the previous hour/day/week, Cost by provider, project, service and environment, Deployment, traffic, retry and job timestamps around the first inflection. Compare the same time window before and after the change so volume and unit-cost effects do not get mixed.
How should I verify a claimed saving?
Use comparable workload, currency and billing periods. Include retries, failure rates and shared costs, and distinguish a one-off credit from a recurring improvement. Record the baseline and observation window so another person can reproduce the comparison.
Should uncertain cost be forced into a project?
No. Keep it unallocated until tags, project IDs, resource IDs or another reliable signal justify attribution. False precision produces worse decisions than visible uncertainty.